Why are some calender events not showing up as available events in URL shortcuts

I recently created several events in Luminate Online. I just tried to create a URL shortcut to one and the system could not find it as a link. I realized that there are also several other events missing from the link options. These events are active and display on the calendar on the constituent side of the site.

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Number:71019

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Luminate_Online

The list of events that is available in the URL shortcuts link is limited within a certain date range, but you can still manually create the URL shortcut (BB745172).